2018-10-10 18:03:03 -04:00
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---
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id: 587d7faa367417b2b2512bd6
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challengeType: 6
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2020-09-18 00:13:05 +08:00
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forumTopicId: 301470
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2020-10-01 17:54:21 +02:00
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title: 给 D3 元素添加工具提示
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2018-10-10 18:03:03 -04:00
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---
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## Description
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2020-09-18 00:13:05 +08:00
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<section id='description'>
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当用户在一个对象上悬停时，提示框可以显示关于这个对象更多的信息。在可视化中有多种方法添加提示框，这个挑战将使用 SVG 的 <code>title</code> 元素。
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请使用 <code>tile</code> 和 <code>text()</code> 方法一起给每组动态添加数据。
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</section>
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2018-10-10 18:03:03 -04:00
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## Instructions
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2020-09-18 00:13:05 +08:00
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<section id='instructions'>
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在每个 <code>rect</code> 节点下面添加一个 <code>title</code> 元素，然后用回调函数调用 <code>text()</code> 方法使它的文本显示数据值。
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</section>
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2018-10-10 18:03:03 -04:00
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## Tests
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<section id='tests'>
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```yml
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tests:
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2020-09-18 00:13:05 +08:00
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- text: 你应该有 9 个 <code>title</code> 元素。
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testString: assert($('title').length == 9);
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- text: 第一个 <code>title</code> 元素的提示框文本应为 12。
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testString: assert($('title').eq(0).text() == '12');
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- text: 第二个 <code>title</code> 元素的提示框文本应为 31。
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testString: assert($('title').eq(1).text() == '31');
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- text: 第三个 <code>title</code> 元素的提示框文本应为 22。
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testString: assert($('title').eq(2).text() == '22');
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- text: 第四个 <code>title</code> 元素的提示框文本应为 17。
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testString: assert($('title').eq(3).text() == '17');
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- text: 第五个 <code>title</code> 元素的提示框文本应为 25。
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testString: assert($('title').eq(4).text() == '25');
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- text: 第六个 <code>title</code> 元素的提示框文本应为 18。
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testString: assert($('title').eq(5).text() == '18');
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- text: 第七个 <code>title</code> 元素的提示框文本应为 29。
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testString: assert($('title').eq(6).text() == '29');
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- text: 第八个 <code>title</code> 元素的提示框文本应为 14。
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testString: assert($('title').eq(7).text() == '14');
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- text: 第九个 <code>title</code> 元素的提示框文本应为 9。
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testString: assert($('title').eq(8).text() == '9');
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2018-10-10 18:03:03 -04:00
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='html-seed'>
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```html
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<style>
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.bar:hover {
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fill: brown;
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}
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</style>
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<body>
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<script>
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const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
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const w = 500;
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const h = 100;
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const svg = d3.select("body")
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.append("svg")
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.attr("width", w)
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.attr("height", h);
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svg.selectAll("rect")
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.data(dataset)
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.enter()
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.append("rect")
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.attr("x", (d, i) => i * 30)
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.attr("y", (d, i) => h - 3 * d)
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.attr("width", 25)
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.attr("height", (d, i) => d * 3)
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.attr("fill", "navy")
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.attr("class", "bar")
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2020-09-18 00:13:05 +08:00
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// 在下面添加你的代码
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2018-10-10 18:03:03 -04:00
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2020-09-18 00:13:05 +08:00
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// 在上面添加你的代码
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2018-10-10 18:03:03 -04:00
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svg.selectAll("text")
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.data(dataset)
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.enter()
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.append("text")
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.text((d) => d)
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.attr("x", (d, i) => i * 30)
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.attr("y", (d, i) => h - (d * 3 + 3))
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2018-10-10 18:03:03 -04:00
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</script>
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</body>
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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2020-09-18 00:13:05 +08:00
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```html
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<style>
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.bar:hover {
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fill: brown;
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}
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</style>
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<body>
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<script>
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const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
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const w = 500;
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const h = 100;
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const svg = d3.select("body")
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.append("svg")
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.attr("width", w)
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.attr("height", h);
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svg.selectAll("rect")
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.data(dataset)
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.enter()
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.append("rect")
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.attr("x", (d, i) => i * 30)
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.attr("y", (d, i) => h - 3 * d)
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.attr("width", 25)
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.attr("height", (d, i) => d * 3)
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.attr("fill", "navy")
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.attr("class", "bar")
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.append("title")
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.text((d) => d)
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svg.selectAll("text")
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.data(dataset)
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.enter()
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.append("text")
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.text((d) => d)
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.attr("x", (d, i) => i * 30)
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.attr("y", (d, i) => h - (d * 3 + 3))
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</script>
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</body>
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2018-10-10 18:03:03 -04:00
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```
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2020-08-13 17:24:35 +02:00
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2020-09-18 00:13:05 +08:00
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</section>
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